the united states is responding to deadly attacks and u.s. embassies that killed an ambassador and three americans. this morning, to u.s. detroit -- destroyers are headed towards the libyan coast. >> this is a mid more violence at embassies in libya and egypt. we get the latest. >> u.s. flags flew at half staff at the white house and the capitol as the nation mourned. a group of heavily armed madeleine -- militants launched a attack at a u.s. complex in benghazi, pelting it with gunfire and rocket-propelled grenades. they fill the safe room with smoke and drive at least one person in it with the roof. in the end, four died, including chris stevens, the u.s. ambassador to libya, who helped save benghazi during last year cost revolution. he is the first u.s. ambassador to be killed since 1979. a lifelong friend opened up about the loss. >> i lost somebody who unconditionally loved just about everybody. what the world lost was a great diplomat who was interested in peace and humanity, who really understood the culture of the middle east. >> a se